<p>The Metropolitan Police said they were treating as a “terrorist incident” the stabbing of a police officer at the Houses of Parliament in London on March 22.</p><p>Nearby, on Westminster Bridge, a car knocked down and injured several people.</p><p>Video uploaded to Twitter showed people on the bridge being helped up by other members of the public, as well as an air ambulance landing at Parliament Square.</p><p>This video, from Brexit Central journalist David Scullion, shows people rushing out of parliament.</p><br />
